660307213 has 2 divisors, whose sum is σ = 660307214. Its totient is φ = 660307212.

The previous prime is 660307189. The next prime is 660307243. The reversal of 660307213 is 312703066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599123529 + 61183684 = 24477^2 + 7822^2 .

It is a cyclic number.

It is not a de Polignac number, because 660307213 - 2⁵ = 660307181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660307243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330153606 + 330153607.

It is an arithmetic number, because the mean of its divisors is an integer number (330153607).

Almost surely, 2^660307213 is an apocalyptic number.

It is an amenable number.

660307213 is a deficient number, since it is larger than the sum of its proper divisors (1).

660307213 is an equidigital number, since it uses as much as digits as its factorization.

660307213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 660307213 is about 25696.4435866133. The cubic root of 660307213 is about 870.7938379062.

The spelling of 660307213 in words is "six hundred sixty million, three hundred seven thousand, two hundred thirteen".